Best GZ34 listed at

5AR4=GZ34=CV1377 Full-Wave Rectifier (5AR4=5V @ 1.9A Filament, PIV=1500V, Imax=225-250ma)


(click on links below to check stock) 5AR4=GZ34 Philips and Philips Miniwatt Holland metal base 1951 - 1958 (1st version and best) 5AR4=GZ34 Philips and Philips Miniwatt Holland black base and brown base 1958 - 1963 5AR4=GZ34 Mullard England "FAT BASE" 1958 - 1962 (f31 series) 5AR4=GZ34 Mullard England 1962 - 1975 (f32 series) $139 - $199/each 5AR4=GZ34 Mullard England 1979 (f33 series) $119/each - best value 5AR4=GZ34 GE "small bottle" 1960's $75/each 5AR4=GZ34 Sylvania "Big Bottle" 1970's $125 - $150/each 5AR4=GZ34 JAPAN 1960's - 1970's $75/each
BEST VALUE 5AR4=GZ34 VALVO HOLLAND 1958 (f31 series) $238 each (1st series after metal base tubes) listed below - closest sound to metal base GZ34 at less than 1/2 the price 10 tubes $239 ea) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping - Modwright Oppo 95 power supply - Modwright Oppo 105 power supply 9.9 - Modwright 36.5 power supply
5AR4=GZ34 Mullard England "FAT BASE" 1958-1962 (the first Mullard series made and best sounding GZ34 Mullard) (base diameter = 1.4") (f31 series) - VOX AC30 - CARY - Matchless Chieftan 1 tube $250) 5AR4/GZ34 Mullard fat base used/tests like new (f31-B8K=1958) smeared printing in Mullard box
5AR4=GZ34=CV1377 Mullard England 1962-1975 - Bob Latino M-125 - Cary - Dynaco ST-70 - Scott LK-48 - Matchless SC30 - Matchless Lightning 15 - Melody H2A Integraded Amp - Modwright PS and 9.0 preamp - Modwright LS100 - Supratek (all models) - Marshall - Fender - Dr. Z Z-28 (6V6 amp) - VOX AC15, AC30 - Prima Luna PL3 preamp - Victoria Double Deluxe (Tweed) - Victoria Regal 2 - Donald North headphone amp - Cary 302 MK2 phono - AES AE-3 MKII preamp 5AR4=GZ34 Mullard NOS: --------------------- 1962-1969: (f32 series) --------- 1 tube $199) GZ34 Mullard NOS rebranded ADZAM 1966 in white box, a few small scratches on base (recommended) 2 tubes $185 each) GZ34 Mullard NOS rebranded ADZAM 1963 slightly tilted glass in ADZAM boxes - best value 5AR4=GZ34 Mullard NOS: --------------------- 1970-1975: (f32 series) --------- 1 pair $355) GZ34 Mullard NOS rebranded RCA NOS 1970 DK and DH date codes 1 pair $355) GZ34 Mullard NOS rebranded RCA NOS 1970 DX date code and 1971 FC date code 1 pair $340) GZ34 Mullard NOS rebranded RTC NOS 1973 same date codes (good value) 1 pair $360) GZ34 Mullard NOS rebranded DUMONT NOS 1971 same date codes 1 pair $350) GZ34 Mullard NOS rebranded Philips NOS 1973 same date codes 1 pair $340) GZ34 Mullard NOS rebranded Philips 1972 1 pair $340) GZ34 Mullard NOS rebranded Philips 1971 and 1973 1 pair $335) GZ34 Mullard NOS rebranded Philips 1970, 1 tube good printing, 1 tube faded printing 1 pair $340) GZ34 Mullard NOS rebranded Philips 1975 same date codes (recommended) 1 pair $340) GZ34 Mullard NOS rebranded Philips 1974-1975 (recommended) 1 tube $170) GZ34 Mullard NOS rebranded ADZAM 1970 1 tube $170) GZ34 Mullard NOS rebranded Philips 1975 1 tube $170) GZ34 Mullard NOS rebranded Philips 1971 1 tube $170) GZ34 Mullard rebranded Telefunken around 1970 can't read date code, but I sold another one from 1970 that was identical to this tube - best value 1 tube $170) GZ34 Mullard NOS rebranded Tungsram 1972 1 tube $170) GZ34 Mullard NOS branded Sylvania 1970 KUHL-TUBE CRYO-TREATED 1966-1979: ------------------------------- 1 cryo Kuhl-tube $185) GZ34 Mullard NOS rebranded Philips 1970 faded printing 4 cryo Kuhl-tubes $175 each) GZ34 Mullard branded Raythen Kuhl-Tube cryo-treated NOS 1974 6 tubes not cryo-treated $160 each) GZ34 Mullard branded Raytheon 1974 in Raytheon boxes (best value) 1 Kuhl-Tube cryo-treated $199) GZ34 Mullard branded Tungsram in Tungsram box 1966 (recommended) 1 Kuhl-Tube cryo-treated tube $170) GZ34 Mullard rebranded VALVO 1979 (best value) 1976-1979: --------- 10 tubes $119 each) GZ34 Mullard NOS (f33-B9A5=1979) date codes, also dated (3-80=1980) on glass - reboxed - from bulk pack (best value in stock) <--------------- 1 tube $125) GZ34 Mullard rebranded Philips 1978 (f33 series) good value BEST VALUE: ---------- 5AR4 Mullard low hours/like new and used/test very good: ------------------------------------------------------- 1 pair $250) GZ34 Mullard branded Philips Miniwatt used/test like new 1966 - best value 1 tube $139) GZ34 Mullard branded Telefunken used/tests like new 1963, a few scratches on base, slightly smeared printing - best value 1 tube $155) 5AR4 Mullard branded Siemens low hours/like new 1965 (good value)
to see GZ34 Holland Metal Base 1951-1958 stock

GZ34 Philips Miniwatt Holland 1955
to see GZ34 Holland Metal Base 1951-1958 stock

5AR4=GZ34 Holland "Black Base" and "Brown Base" 1958-1962 - Woo Audio 6 - Cary PH302 phono listed below - same sound as 1957 metal base (2 pairs = 4 tubes for $899) (BEST IN STOCK) 1 pair $476) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping 1 pair $476) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping 1 pair $476) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping 1 pair $476) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping 1 pair $476) GZ34 Valvo Holland NOS (f31-X8C=1958) black base double "D" getter halos in original wrapping 1 tube $275 Kuhl-Tube cryo-treated) 5AR4 Adzam Holland "brown base" NOS (f33-L0K=1960) in Adzam box (recommended)
1 tube $259) 5AR4 Adzam Holland "brown base" NOS (f33-L0H=1960) (recommended)
listed below 1 tube $249) 5AR4 Philips Miniwatt "brown base" NOS, slightly smeared printing (f33-L0E=1960) small scuff mark on glass, in white box (good value) 1 tube $249) 5AR4 Philips Miniwatt "brown base" NOS reboxed, fair printing, (f33-L0D=1960) (recommended) 1 tube $195) 5AR4 Philips Miniwatt "brown base" used/tests like new, good printing, some staining on glass, 1959 (f33 X9L) (recommended) 1 tube $199) 5AR4 Philips Miniwatt "brown base" used/tests like new, very good printing, some staining on glass, 1960 (f33 X0A) (recommended, best condition) 1 tube $189) 5AR4 Philips Miniwatt "brown base" used/tests like new, very good printing, some staining on glass, 1960 (f33 X0A) (recommended, 2nd best condition) 1 tube $189) 5AR4 Philips Miniwatt "brown base" used/tests like new, very good printing, some staining on glass, 1959 (f33 X9I) (recommended, 2nd best condition) 1 tube $149) 5AR4 Philips Miniwatt "brown base" rebranded ADZAM used/good, good printing, some staining on glass, 1959 (f32 X9H) (good value) BLACK BASE: DOUBLE "D" GETTER HALOS (1959-1962) (recommended) ---------- 1 Pair $449) CV1377=5AR4 Philips "Belgium" Holland NOS double "D" getter halos original boxes (best value) 1 tube) f33 L1J=1961 1 tube) f33 L2D=1962 listed below 1 tube $259) 5AR4 VALVO HOLLAND NOS (f32-X9G=1959) (recommended) listed below 1 tube $259) 5AR4 PHILIPS MINIWATT HOLLAND NOS (f33 L2F2=1962) (recommended) listed below 1 tube $259) 5AR4 ADZAM HOLLAND NOS (f33 L2D=1962) (recommended) listed below 1 tube $259) 5AR4 VALVO HOLLAND NOS (f33-L2D=1962) (recommended) listed below 1 tube $259) 5AR4 TELEFUNKEN HOLLAND NOS reboxed (f33 L2G1=1962) (recommended) listed below 1 tube $225) GZ34 SIEMENS HOLLAND like new/only used a few hours in SIEMENS box (f3 L2H1=1962), perfect condition (best value) 3 tubes listed below (buy 2 receive 5% discount, buy 3 receive 10% discount) 1 tube $259) 5AR4 MINIWATT HOLLAND NOS (f33 L2H5=1962) (recommended) 1 tube $255) 5AR4 MINIWATT HOLLAND NOS (f33 L2H5=1962) slightly tilteed glass (recommended) 1 tube $255) 5AR4 MINIWATT HOLLAND NOS (f33 L2D=1962) slightly tilteed glass (recommended) HOLLAND BLACK BASE USED with double D getter halos 1958-1962: (BEST VALUE) -------------------------------------------------------------------------- listed below 1 tube $139) 5AR4 Philips Miniwatt black base used/tests like new, good printing, a few stains on glass, 1962 (f33 L2I1) (recommended) listed below 1 tube $139) 5AR4 Miniwatt Holland black base used/tests like new, good printing, a few stains on glass, 1962 (f33 L2B) (recommended) listed below 1 tube $125) 5AR4 Amperex Holland branded "HH SCOTT" black base used/tests like new, good printing, very good top getter, some stains on glass from usage 1958 (f31 X8K) (best value) (oldest used black base in stock) listed below 1 tube $139) 5AR4 Philips Miniwatt black base used/tests like new, good printing, a few stains on glass, 1961 (f33 L1J) (BEST VALUE) listed below 1 tube $142) 5AR4 Philips Miniwatt black base used/tests like new, very good printing, a few stains on glass, 1962 (f33 L2H3) (recommended) listed below 1 tube $139) 5AR4 Philips Miniwatt black base used/tests like new, good printing, a few stains on glass, 1962 (f33 L2J1) (recommended)
5AR4=GZ34 GE small bottle 1960's - Tubelab SE (tubelab.com) - Trinity TC-15 (2010) Best 5AR4 GE listed at: 1 tube $79) 5AR4=GZ34 Admiral by GE USA black base small bottle 1960's in Admiral box 1 tube $79) 5AR4=GZ34 GE USA black base small bottle 1960's same date codes (IU), copper plates, in white boxes
Sylvania Big Bottle 1970's - Tubelab SE (tubelab.com) - Trinity TC-15 (2010) - Pagano 300B SET - Dynaco ST-120 (ST120) - Swart Atomic Jr (2011) SYLVANIA BIG BOTTLE: ------------------- 1 tube $165) 5AR4 / GZ34 Sylvania Big Bottle NOS 1970's original box (56/40 and 57/40) 1 tube $140) 5AR4 / GZ34 Sylvania Big Bottle NOS rebranded RCA but printing is wiped off glass in original RCA boxes 1970's 1 tube $125) 5AR4 / GZ34 Sylvania Big Bottle USA low hours/like new 1970's in white box
5AR4=GZ34 JAPAN 1970's 5AR4 JAPAN "X" raised edge on top of glass sold out
GZ34 / 5AR4 SUBSTITUTE (with limitations) The 5Z4GT is a good sub for the 5AR4. To be a good sub, it must be INDIRECTLY heated (Most 5 volt rectifiers are DIRECTLY heated, but the 5AR4 / GZ34 isn't). Also it must be small, so as to fit into the same space as the 5AR4. The British type GZ37 fits the first requirement, but is alot taller, almost as big as a 5R4. The 5AR4 is rated up to 250 mA, and most stereo amps will pull a fair load from them. Some monoblocks, however, don't use half that much current. (example: the British QUAD II amps). For lower current requirements I recommend the 5Z4GT type which are an indirectly heated type very similar in size and appearance to the 5AR4. The 5Z4GT is good for 350 V on the plate vs. 450 V for the 5AR4. It also has a MAX DC Output current rating of 125ma vs. 250ma for the 5AR4. Use it as a sub for the 5AR4 only where ratings permit.
GZ34=5AR4 TECHNICAL NOTES
The GZ34 is an example of a typical high current rectifier for small equipment use. It is indirectly heated but the cathode is tied to one side of the heater. The transformer HT winding would be centre tapped. The centre going to ground. Each anode goes positive in turn and current flows. This way rectification takes place on every half cycle, and gives the name full wave. The wide glass tube envelope is 32mm in diameter, the base is wider, and the valve stands 72 mm high from base to the top of the envelope. This excludes the base pin length. (5AR4=5V @ 1.9A Filament, PIV=1500V, Imax=225-250ma) Characteristics and limiting values: Capacitor input --------------- Vtr 2x300 2x350 2x400 2x450 2x500 2x550 Vrms Io <250 <250 <250 <250 <200 <160 mA Rt 2x50 2x75 2x100 2x125 2x150 2x175 ohm C <60 <60 <60 <60 <60 <60 F Vout 300 350 400 450 530 610 V Choke input ---------- Vtr 2x300 2x350 2x400 2x450 2x500 2x550 Vrms Io <250 <250 <250 <250 <250 <225 mA L 10 10 10 10 10 10 H Rt 0 0 0 0 0 0 ohm Vout 240 283 326 370 415 460 V